Olethreutes pivanica Dubatolov, Bogunova & Nedoshivina

Dubatolov, Vladimir V., Bogunova, Anna A. & Nedoshivina, Svetlana V., 2014, Review of the Olethreutes bowmanana-magadana species group, with the description of a new species from the Amur River, Russia (Lepidoptera, Tortricidae), Zootaxa 3779 (3), pp. 375-382 : 380-381

Olethreutes pivanica Dubatolov, Bogunova & Nedoshivina , sp. n.

( Figs. 5–6 )

Type material: Holotype: ♂, RUSSIA, Khabarovsk Province, near Komsomolsk-na-Amure, Pivan, 50° 34’ N 137° 03’ E, 16.vi. 2008, leg. V. V. Dubatolov. Deposited in ISEA. Paratype (allotype): female, the same locality, 14.vi 2008, leg. V. V. Dubatolov.

Description. Forewing length 9 mm. Head: Dark brown; labial palpi relatively small, slightly broadened distally, covered by dark brown scales. Antennae brown, ca. one-half forewing length. Thorax: Dark brown. Forewing with costal margin slightly convex, apex rounded, termen slightly oblique, tornus rounded; upperside ground color brownish-black; pattern typical of members of genus, consisting of transversal dark brownish fasciae with narrow, lighter, dove grayish striae between them; median stria not contrasting, with sparse dark scales, extending from basal one-third of costa towards one-half of dorsal margin, outer margin of dark median fascia slightly convex, jagged, with small angle in central cell; postmedian transversal stria fused dorsally, enclosing darker pretornal patch; submarginal stria dark and indistinct; dark external field triangularly narrowed towards tornus; light pattern brighter around discal vein. Forewing cilia brownish-grey. Hind wing ovoid with slightly extended apex, dark brown with slightly lighter base; costal margin with elongate basal lobe about 1/3 of costal length, its fore margin with elongate special androconial scales ( Fig. 12 ). Cilia lighter than hindwing. Abdomen: Dark gray. Male genitalia ( Fig. 10 ) with uncus bifurcate apically, covered with long hairs. Socii separate, partly fused with tegumen, forming broad ovoid processes, covered with long hairs. Gnathos membranous. Valva long, with broad basal part; cucullus roughly widened apically, forming round club covered by long chaetae; cucullus apex more than four times as broad as valva neck; valva neck long, narrow, without chaetae; sacculus with narrowly triangular apical process, broader towards costa, narrower ventrally, forming rounded ventral lobe, densely covered with strong chaetae; field of chaetae expanded at costa forming a row at cucullus base, ending in two strong chaetae; sacculus with a cluster of chaetae near ventral lobe of triangular process, ventral edge of sacculus covered with row of hairs; anterior group of sparse, weaker chaetae located at distal edge of basal cavity. Aedeagus slightly curved, dorsally membranous; sclerotized ventral part of aedeagus forming a narrow apical process, curved clockwise with a strong spine on dorsum. Female genitalia ( Fig. 11 ) with papillae anales narrow, elongate, slightly broadened apically. Sternite VII horseshoe-like, forming two broad bands laterally from ostium. Ostium surrounded by broad semicircular sclerite extended caudally. Vaginal sinus forming narrow goblet-like sclerite, slightly hollowed proximally. Ductus burase moderate in length. Corpus bursa ovoid, without signum.

Diagnosis. Olethreutes pivanica is not easily distinguished from the related Palearctic species by wing pattern alone, but it is noticeably darker. The male genitalia of O. pivanica are similar to those of O. magadana ( Falkovitsh 1965) from the Kolyma region in the North-East Asia and O. kamtshadala ( Falkovitsh 1966) from Kamchatka. All these species have a strong process of the sacculus that is covered by dense strong chaetae; the basal part of valva is broad, and the cucullus is club shaped. Although similar, the shape of the sacculus process is different: ovoid and broadly rounded apically in O. kamtshadala , narrowly triangular in O. pivanica , and broadly triangular in O. magadana . The ratio of the length to width of this process is about 2: 1 in O. pivanica and 1: 1 in O. magadana . The row of chaetae on the costal edge of the process base is long in O. pivanica (nearly equal to the length of the process) and very short in O. magadana . The ratio of the length to width of the valva neck is 3: 1 in O. pivanica and 4: 1 in O. magadana . In addition, the club shape of the cucullus is more or less round in O. pivanica and ovoid in O. magadana . The North American species O. bowmanana ( McDunnough 1923) is less similar to the new species than are the two East Asian ones. The saccular process of O. bowmanana is very broad, nearly rectangular, and expands immediately from the basal cavity, whereas in all Asian species it is located conspicuously more distal. The valval neck in O. bowmanana is short and very broad, only slightly narrower than the cucullus apex.

Biology. Olethreutes pivanica was collected at the lower part of a petrophytous sunny slope of a terrace of the Amur River bank. Moths were flying over the small boulders covered with sparse vegetation. The species probably occurs in the middle part of the petrophytous slope, but the slope is too steep for collecting. The species flew with the more common Cnephasia ussurica Filipjev 1962 , and these were the only tortricoid species observed at this slope. Neither was found in other places of the Region ( Syachina 2008), and they are probably restricted to this biotope. Another characteristic species at this site was the Holarctic Clossiana tritonia (Boeber 1812) [ Nymphalidae ], represented by the topotype population of C. t. amphilochus ( Ménétriès 1859).

Distribution. Olethreutes pivanica is probably restricted to the Lower Amur basin and the mountains of the Region.

Etymology. The new species is named after the type locality place, Pivan.

Remarks. The new species is most similar to O. magadana , which was reported to occur in Chukotka, Magadan Province, Koryakia, Chita Province and Taimyr (Kuznetzov 2001). We found a few specimens labeled as O. magadana that were identified incorrectly by V. I. Kuznetzov in the collection of the Zoological Institute, St. Petersburg. After dissection, specimens from Chukotka were identified as O. exaridana (Kuznetzov 1991) ; a female from Kolyma was not identified, but it is not similar to the O. magadana-kamtshadala species group based on its genitalia. Another female from Taimyr has the genitalia similar to the new species and belongs to an uncertain species of the same complex. So, O. magadana Flkv. is actually known only from the Kolyma basin. All other data about distribution of O. magadana Flkv. in Chukotka and Kolyma were probably based on the incorrect identification. Additional specimens from Chukotka identified by Prof. V. I. Kuznetzov as O. kamtshadala Flkv. belong to Cymolomia taigana Falkovitsh, 1966 . Thus, occurrence of O. kamtshadala Flkv. in Chukotka remains also questionable.

Figures

FIGURES 1 – 6. Olethreutes spp., adults. 1 – 2. O. bowmanana. 1, holotype, male, CANADA, Alta., Nordegg; 2, holotype labels. 3, O. magadana, holotype, male RUSSIA, 160 km SE from Magadan, settl. Madaun. 4, O. kamtshadala, holotype, male, RUSSIA, Koryakia autonomous region, Apuka, Pakhachinsky Range. 5 - 6, O. pivanica. 5, holotype, male, RUSSIA, Khabarovsk Province, near Komsomolsk-na-Amure, Pivan; 6, paratype, female, the same locality.

FIGURES 11 – 12. Olethreutes pivanica, Khabarovsk province. 11 - female genitalia; 12 - male hindwing costal margin, underside.

FIGURES 7 – 10. Olethreutes spp., male genitalia, holotypes. 7, O. kamtshadala, Russia, Kamchatka; 8, O. magadana, Russia, Magadan Province; 9, O. bowmanana, Canada, Alberta; 10, O. pivanica, Russia, Khabarovsk Province.